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Is it a percentage related to the partition size? Or, is it a hard-fixed number?

What if it's a non-system partition? Why would it matter to Windows if it isn't installed into it?

In my case, I run Windows 8.1

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This information has not been published by Microsoft – Ramhound Mar 25 '14 at 21:27

I'm not sure about Win8.1 but Windows XP and 7 notify the user when

  • less than 200 MB
  • less than 80 MB
  • less than 50 MB
  • 0 MB

of free space is left

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Disk space checks

Windows Vista polled available disk space every minute while Windows 7 does this every 10 minutes. This is designed for performance reasons and there is no likelihood of causing an unrecoverable problem to the Operating System or to your hardware.

This would be any fixed or external hard drives (USB, eSATA, 1394/FireWire). When this polling occurs, Windows 7 will pop up with a notification at the following thresholds:

  • Free space less than 200 MB
  • Free space less than 80 MB
  • Free space less than 50 MB
  • Free space equals zero

Windows 7 does not poll Zip Drives, Floppies or any other "removable" media drives.

Source: The low disk space notification message might be delayed up to 10 minutes in Windows 7

I couldn't find any official articles regarding Windows 8.x, but I assume things aren't any different than Windows 7. Apparently there's no way to tweak the threshold values or the polling interval, and you can't exclude specific disks/partitions either.

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Just to be sure, this notice also applies to a disk without Windows installed? – Karolinger Apr 4 '14 at 15:08
@Karolinger Yes. In Windows 7 and earlier this feature can be disabled, but I'm not sure whether the method still applies to Windows 8.x. – and31415 Apr 4 '14 at 15:18

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